If you suspect a clog instead, check the “symptoms of a clogged heater core” section below 1) low coolant level one of the most common signs of heater core trouble is mysteriously disappearing coolant Learn how to identify and fix a leaking heater core, which can cause foggy windows, sweet smell, wet carpets and low coolant level Find out the common causes of heater core leaks, such as corrosion, cracked housing and blocked passages, and how to diagnose them. The best heater core leak repair involves using a specialized sealant or replacing the heater core to ensure proper function and prevent coolant loss. I stopped my heater core leak without swapping it out—used sealant, flushed the lines, and tuned heat flow
Here’s how to fix yours and avoid a full teardown. A leaking heater core can also cause the windshield to fog up, as coolant vapor travels through the defrost vents Try to wipe the fog off of the windshield—if it smears and has a sweet smell, it’s coolant from a leaking heater core. A leaking heater core can be a frustrating problem, but with the right knowledge and approach, it can be addressed effectively
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